Ansmann
Ansmann makes batteries and chargers that actually hold up, sorry, that actually hold up over time, which matters more than most people realize when you're mid-session and your toy dies. Their rechargeable AA and AAA cells run longer per charge than most supermarket alternatives, and they're built to handle the kind of repeated cycling that sex toy use demands. If you've ever had a vibrator eat through disposables in a week, switching to Ansmann rechargeables is one of those small changes that quietly fixes an annoying problem. Mshop stocks a solid range of Ansmann batteries and chargers, shipped discreetly to your door in 1-2 days.